Commit 4287e4de authored by Russell King's avatar Russell King Committed by Al Viro
Browse files

fs/adfs: dir: add more efficient iterate() per-format method 



Rather than using setpos + getnext to iterate through the directory
entries, pass iterate() down to the dir format code to populate the
dirents.

Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent cdc46e99

fs/adfs/adfs.h

+1 −0
Original line number Diff line number Diff line
@@ -120,6 +120,7 @@ struct object_info { 
struct adfs_dir_ops {

	int	(*read)(struct super_block *sb, unsigned int indaddr,

			unsigned int size, struct adfs_dir *dir);

	int	(*iterate)(struct adfs_dir *dir, struct dir_context *ctx);

	int	(*setpos)(struct adfs_dir *dir, unsigned int fpos);

	int	(*getnext)(struct adfs_dir *dir, struct object_info *obj);

	int	(*update)(struct adfs_dir *dir, struct object_info *obj);

fs/adfs/dir.c

+2 −14
Original line number Diff line number Diff line
@@ -240,12 +240,8 @@ static int adfs_iterate(struct file *file, struct dir_context *ctx) 
	struct inode *inode = file_inode(file);

	struct super_block *sb = inode->i_sb;

	const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;

	struct object_info obj;

	struct adfs_dir dir;

	int ret = 0;



	if (ctx->pos >> 32)

		return 0;

	int ret;



	down_read(&adfs_dir_rwsem);

	ret = adfs_dir_read_inode(sb, inode, &dir);
@@ -263,15 +259,7 @@ static int adfs_iterate(struct file *file, struct dir_context *ctx) 
		ctx->pos = 2;

	}



	ret = ops->setpos(&dir, ctx->pos - 2);

	if (ret)

		goto unlock_relse;

	while (ops->getnext(&dir, &obj) == 0) {

		if (!dir_emit(ctx, obj.name, obj.name_len,

			      obj.indaddr, DT_UNKNOWN))

			break;

		ctx->pos++;

	}

	ret = ops->iterate(&dir, ctx);



unlock_relse:

	up_read(&adfs_dir_rwsem);

fs/adfs/dir_f.c

+18 −0
Original line number Diff line number Diff line
@@ -302,6 +302,23 @@ adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj) 
	return ret;

}



static int adfs_f_iterate(struct adfs_dir *dir, struct dir_context *ctx)

{

	struct object_info obj;

	int pos = 5 + (ctx->pos - 2) * 26;



	while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {

		if (__adfs_dir_get(dir, pos, &obj))

			break;

		if (!dir_emit(ctx, obj.name, obj.name_len,

			      obj.indaddr, DT_UNKNOWN))

			break;

		pos += 26;

		ctx->pos++;

	}

	return 0;

}



static int

adfs_f_update(struct adfs_dir *dir, struct object_info *obj)

{
@@ -359,6 +376,7 @@ bad_dir: 


const struct adfs_dir_ops adfs_f_dir_ops = {

	.read		= adfs_f_read,

	.iterate	= adfs_f_iterate,

	.setpos		= adfs_f_setpos,

	.getnext	= adfs_f_getnext,

	.update		= adfs_f_update,

fs/adfs/dir_fplus.c

+21 −0
Original line number Diff line number Diff line
@@ -118,8 +118,29 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj) 
	return 0;

}



static int adfs_fplus_iterate(struct adfs_dir *dir, struct dir_context *ctx)

{

	struct object_info obj;



	if ((ctx->pos - 2) >> 32)

		return 0;



	if (adfs_fplus_setpos(dir, ctx->pos - 2))

		return 0;



	while (!adfs_fplus_getnext(dir, &obj)) {

		if (!dir_emit(ctx, obj.name, obj.name_len,

			      obj.indaddr, DT_UNKNOWN))

			break;

		ctx->pos++;

	}



	return 0;

}



const struct adfs_dir_ops adfs_fplus_dir_ops = {

	.read		= adfs_fplus_read,

	.iterate	= adfs_fplus_iterate,

	.setpos		= adfs_fplus_setpos,

	.getnext	= adfs_fplus_getnext,

};

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